Navarro's comments were part of the White House's continued criticism of Trudeau.

Navarro came under scrutiny Sunday for bashing Trudeau after the prime minister criticized Trump in the wake of the G-7 summit held in Canada. Other than he had a news conference because he assumed I was on an airplane and wasn't watching. "That's going to cost him a lot of money".

"If you make a mistake, you should it admit it, learn from it, don't repeat it", Navarro said. "You can't do that", the U.S. president added.

MacLauchlan said he supported the Prime Minister's retaliatory tariffs in response to USA tariffs on Canadian steel and aluminum and called on opposition parties to join him in expressing support for the federal government.

"We should review that in the context of a president who's clearly abusing the national security category as a justification for imposing tariffs", Welch said. It showed a seemingly glowering German Chancellor Angela Merkel and several other leaders appearing to confront a seated Mr Trump. And in fact, despite Canada's tariff, the USA runs a surplus in dairy trade with its northern neighbor.

For Trudeau, "there are fewer things he can get in exchange, there isn't money to splash around to get farmers who have a quota to give it up and this is an important issue in Quebec, which provides many seats for the Trudeau government".

"The US would have enjoyed these benefits had it not made a decision to exit the original TPP deal", said Christophe Bondy, a trade negotiation expert and special counsel at law firm Cooley.

He and other US politicians have long demanded Canada's system of domestic dairy protections either be abolished or heavily modified to give American exports a bigger share.

Trump said that he watched Trudeau's press conference aboard Air Force One and was stunned.

On May 31 - the same day that the United States announced it would impose tariffs on Mexican steel and aluminum - the Mexican subsidiary of United-States-based multinational Whirlpool said its prices would rise across the board by 8% on July 1. That means the Canadian Border Services Agency would investigate to see if they were exporting at prices lower than their cost of production, or lower than the prices they get in their home USA market.